5 Celebrity Feuds Gone Wild: Katy vs. Taylor, J.Lo vs. Mariah + More

From subtweets to side-eye to diss tracks, "beef" is a pop music tradition of the highest order.

You'll no doubt recall the ongoing (?) Katy Perry vs. Taylor Swift drama: after months of subliminal shots from the 1989 singer-songwriter — Swift even wrote about the "Bad Blood" between the two — Perry recently addressed the "feud" on a Carpool Karaoke.

Speaking of Swift, did you hear about the Lorde vs. Diplo vs. Taylor Swift Twitter drama? One word: "booty."

And of course, who could forget a pop classic: Justin Timberlake vs. Britney Spears? Once the power pop couple broke up, all hell broke loose, including the "Cry Me A River" music video — featuring a very familiar-looking co-star.

For all these duels and more, watch the latest installment of PopCrush 360 above.